// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_NAVIGATION_HANDLE_CORE_H_
#define CONTENT_BROWSER_APPCACHE_APPCACHE_NAVIGATION_HANDLE_CORE_H_

#include <memory>

#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "content/common/appcache_interfaces.h"

namespace content {

class AppCacheNavigationHandle;
class AppCacheHost;
class AppCacheServiceImpl;
class ChromeAppCacheService;

// PlzNavigate
// This class is used to manage the lifetime of AppCacheHosts
// created during navigations. This class is created on the UI thread, but
// should only be accessed from the IO thread afterwards. It is the IO thread
// pendant of AppCacheNavigationHandle. See the
// AppCacheNavigationHandle header for more details about the lifetime of
// both classes.
class AppCacheNavigationHandleCore : public AppCacheFrontend {
public:
    AppCacheNavigationHandleCore(
        base::WeakPtr<AppCacheNavigationHandle> ui_handle,
        ChromeAppCacheService* appcache_service,
        int appcache_host_id);
    ~AppCacheNavigationHandleCore() override;

    // Returns the raw AppCacheHost pointer. Ownership remains with this class.
    AppCacheHost* host() { return precreated_host_.get(); }

    // Initializes this instance. Should be called on the IO thread.
    void Initialize();

    // Returns the precreated AppCacheHost pointer. Ownership of the host is
    // released here.
    static std::unique_ptr<AppCacheHost> GetPrecreatedHost(int host_id);

    AppCacheServiceImpl* GetAppCacheService();

protected:
    // AppCacheFrontend methods
    // We don't expect calls on the AppCacheFrontend methods while the
    // AppCacheHost is not registered with the AppCacheBackend.
    void OnCacheSelected(int host_id, const AppCacheInfo& info) override;
    void OnStatusChanged(const std::vector<int>& host_ids,
        AppCacheStatus status) override;
    void OnEventRaised(const std::vector<int>& host_ids,
        AppCacheEventID event_id) override;
    void OnProgressEventRaised(const std::vector<int>& host_ids,
        const GURL& url,
        int num_total,
        int num_complete) override;
    void OnErrorEventRaised(const std::vector<int>& host_ids,
        const AppCacheErrorDetails& details) override;
    void OnLogMessage(int host_id,
        AppCacheLogLevel log_level,
        const std::string& message) override;
    void OnContentBlocked(int host_id, const GURL& manifest_url) override;

private:
    std::unique_ptr<AppCacheHost> precreated_host_;
    scoped_refptr<ChromeAppCacheService> appcache_service_;
    int appcache_host_id_;
    base::WeakPtr<AppCacheNavigationHandle> ui_handle_;

    DISALLOW_COPY_AND_ASSIGN(AppCacheNavigationHandleCore);
};

} // namespace content

#endif // CONTENT_BROWSER_APPCACHE_APPCACHE_NAVIGATION_HANDLE_CORE_H_
